/Engine/Source/Runtime/MovieSceneCapture/Public/Protocols/UserDefinedCaptureProtocol.h
Called when image pixel data is ready to be processed
void OnPixelsReceivedImpl ( const [FCapturedPixels](API\Runtime\MovieSceneCapture\Protocols\FCapturedPixels) & Pixels, const [FCapturedPixelsID](API\Runtime\MovieSceneCapture\Protocols\FCapturedPixelsID) & StreamID, [FFrameMetrics](API\Runtime\MovieSceneCapture\FFrameMetrics) FrameMetrics )